A 16-year-old boy from Vaughan has died of injuries suffered in a single vehicle collision late Tuesday night near King Vaughan Road and Kipling Avenue.
A 15-year-old boy remains in hospital fighting for his life.
York Regional Police say the vehicle they were, a Kia Sportage, had left the roadway and collided with a tree.
Two others, a male and a female, both 16 were treated for serious injuries.
The driver, 17-year-old female, suffered minor injuries.
Police are asking that witnesses, and others who may have dashcam video of what happened, contact the Major Collision Investigation Unit at 1-866-876-5423, ext. 7704, or Crime Stoppers at 1-800-222-TIPS.